The ocamldep command scans a set of Objective Caml source files
(.ml and .mli files) for references to external compilation units,
and outputs dependency lines in a format suitable for the make
utility. This ensures that make will compile the source files in the
correct order, and recompile those files that need to when a source
file is modified.

The typical usage is:

ocamldep options *.mli *.ml > .depend

where *.mli *.ml expands to all source files in the current
directory and .depend is the file that should contain the
dependencies. (See below for a typical Makefile.)

Dependencies are generated both for compiling with the bytecode
compiler ocamlc and with the native-code compiler ocamlopt.

Add the given directory to the list of directories searched for
source files. If a source file foo.ml mentions an external
compilation unit Bar, a dependency on that unit's interface
bar.cmi is generated only if the source for bar is found in the
current directory or in one of the directories specified with -I.
Otherwise, Bar is assumed to be a module from the standard library,
and no dependencies are generated. For programs that span multiple
directories, it is recommended to pass ocamldep the same -I options
that are passed to the compiler.

-modules

Output raw dependencies of the form

filename: Module1 Module2 ... ModuleN

where Module1, …, ModuleN are the names of the compilation
units referenced within the file filename, but these names are not
resolved to source file names. Such raw dependencies cannot be used
by make, but can be post-processed by other tools such as Omake.

-native

Generate dependencies for a pure native-code program (no bytecode
version). When an implementation file (.ml file) has no explicit
interface file (.mli file), ocamldep generates dependencies on the
bytecode compiled file (.cmo file) to reflect interface changes.
This can cause unnecessary bytecode recompilations for programs that
are compiled to native-code only. The flag -native causes
dependencies on native compiled files (.cmx) to be generated instead
of on .cmo files. (This flag makes no difference if all source files
have explicit .mli interface files.)

-ppcommand

Cause ocamldep to call the given command as a preprocessor
for each source file.

-slash

Under Windows, use a forward slash (/) as the path separator instead
of the usual backward slash (\). Under Unix, this option does
nothing.